Is this something that you are wanting to order versus just picking one up that appeals to you?
I like to just drop in and look at what best fits the old place as far as covering any damaged areas, etc. Once past the fittting the space, most all LED will work, so I go to the details which I can see more than model numbers, etc.
Personal preference? Sometimes ordered and brought to me but other times, seeing what I'm getting saves time!
Small point on mounting may be to look for the original connections as they may be left stuffed up in the ceiling and I don't like to have more connections than necessary so I pull those first out and cut them off before placing the new ones.